Broadband high-gain circularly polarized filtering antenna

Abstract

The invention discloses a broadband high-gain circularly polarized filtering antenna, and relates to the field of radio frequency communication. The antenna comprises four layers of dielectric substrates from bottom to top, a first metal ground is printed on the upper surface of the first layer of dielectric substrate, a slot coupling feed network is printed on the second layer of dielectric substrate, a radiation structure is printed on the upper surface of the third layer of dielectric substrate, and a parasitic structure is printed on the lower surface of the fourth layer of dielectric substrate. The first metal ground is a square metal copper surface, the radiation structure is a square chamfered radiation patch, and the parasitic structure is a square slotted parasitic patch; the slot coupling feed network comprises a microstrip feed line and a double-Y-shaped slot, the double-Y-shaped slot is printed on a second metal ground, and the second metal ground and the microstrip feed line are printed on the upper surface and the lower surface of the second dielectric substrate respectively. By using the slot coupling feed network to excite the radiator structure with the circular polarization radiation function and the filtering function, good broadband circular polarization radiation characteristics and high-roll-off filtering characteristics are generated.

Description

Technical field [0001] The present invention relates to the field of radio frequency communications, specifically to a wideband high gain circular polarization filter antenna. Background [0002] In the early days of RF technology, antennas and filters were designed separately and cascaded together. A new concept is proposed to explore ways to reduce size and insertion loss: filter antennas. Filter antennas integrate the functions of the filter and antenna without the need to design the antenna and filter separately and cascade them through a 50 ohm port. This can greatly reduce the size of the structure, reduce the complexity of the structure, reduce insertion loss, and signal interference. At the same time, circularly polarized antennas have been a hot topic of inquiry because they can avoid polarization mismatch and can be widely used in wireless local area network (WLAN) systems. [0003] Circularly polarized filter antennas that combine filter antennas with circular polariza...

AI Technical Summary

Problems solved by technology

At present, most of the circular polarization filter antennas simply cascade the bandpass filter to the circular polarization antenna, or integrate the circular polarization antenna and the bandpass filter, which increases the structural complexity and improves the system performance. Insertion loss

Existing circularly polarized filter antennas have disadvantages such as narrow working bandwidth, which cannot meet the requirements of broadband working environment.

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